Question

mission to mars
carries the answer lies 34 million miles away — on mars.

1. compared to earth, mars is a harsh environment. temperatures average 80 degrees below zero. unlike earth, mars has no breathable. it has no running water.

Explanation:

These are fill-in-the-blank questions about Mars's harsh environment relative to Earth. The first blank refers to the substance needed for breathing that Mars lacks, and the second blank refers to a key feature Earth has that Mars doesn't (paired with the note about no running water, a protective atmospheric feature makes sense).

Answer:

1. First blank: air (or atmosphere, specifically breathable oxygen-rich air)
2. Second blank: ozone layer (or magnetic field, as both protect from radiation and help retain atmosphere/water)